Question: When did Anni-Frid Lyngstad marry Prince Heinrich Ruzzo Reuss of Plauen?
Paraphrase: When was the wedding of Anni-Frid Lyngstad and Prince Heinrich Ruzzo Reuss of Plauen?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q201908 p:P26 ?s . ?s ps:P26 wd:Q1208883 . ?s pq:P580 ?value}